Attachment for sheet metal forming and working machines



y 1945. F. CZAPIEWSKI 2,374,852

ATTACHMENT FOR SHEET METAL FORMING AND WORKING MACHINES Filed March 7, 1942 2 Sheets-Sheet l FRANK CZAPIEWSKI May 1, 1945.

F. CZAPIEWSKI ATTACHMENT FOR SHEET METAL FORMING AND WORKING MACHINES Filed March '7, 1942 2 Sheets-Sheet 2 lllluu w' lll FRANK CZAPIEWSKi gww f Patented May 1, 1945 -ATTACHMENIEOR SHEET'METAL-FORMING nnn wonkme MACHINES- Frank =Gzapiewski,.--Baltimore, Md, assignor, to

artin Company, Middle River, a-corporation of Marylan' a pjiggtion Mareh'l,1942,.:SerialINo.$33,255 4JQlaims. (o1. res-32) 'This invention relatestoapparatusifor shaping metal, and more particularly to-"apparatiis ior shrinking metal during forming operations.

The present apparatus was "developed "re- SpOnSeto agrowingdemand for"a-sing'le=unit for use on a Yon-er hammer,"- orother similar machine, to perform the shrinking of 'a' metal sheet on the-edgiesas well as in the middleor-central portions.

'Heretofore therehasbeen "no' apparatus which could accomplish this "dual function, but it "has 1 'beennecessary to change the corresponding component parts each time'itwas desired t'o switch from an edge shrinking operation to a "central shrinking operation.

It is obvious to th'ose'skill'ed 'in"theart that such 'a' change-over requires considerable chart to accomplish the 'proper alignment "and results in a tremendous-loss of "time with itsin'cident' increase in cost of production.-

'The' present' invention is" a "self contained unit and consists oftwo'members, one of'which serves as a, peening'member and is'attachedto'there- 'cip'rocating ram of a Yod'er hammer; andthe other, serving'as"an 'anvilmember,is'attached I to the tool post of the Yoder hammer. 'By "feeding 'sheet' metal between these two members, an operator can produce donb'lecurvature shapes, remove wrinkles'in previouslyfform'edj pieces, or perform any of several related operations impossible with other metalworking tools.

Further, the present invention is capable "of performing its shrinking operationemciently on various "metals including stainless steels, "aswell as'on aluminum alloys and,i'therefore,' is "of "great importance to all industries working in sheet metal for'varioususes;

While my invention willbe described in'con-' nection with a Yoder hammer, it is to be understood thatthis means ofdes'cription'is only for the sake of clarity and that the apparatus can'be used equally well on other machines of this type capable or reciprocal movement.

As is well known'tothose skille'd'in the art, a "Yoder hammer is amotor driven, adjustable, eccentric apparatus which transmits hammer blows upon a fixed anvil, "The. speed of the blows is governed by the operator through a footpedal. Peculiar'to this machine-is the'spring action linkage which gives the hammer ithe 'fiexible quality necessary "for high speed reciprocative action.

It is,=therefore,-an oba'ect of-the presentlinvention to overcomepthel-above difiiculties and to provide an improved shrinking die which is capable' of shrinking: metal along the edges thereof as well as at any portion which does not contain an edge of the metal, i, e., an inner or central portion of the metal.

thedevice-shownin Figure I, and I Another object of the present invention is at'o provide 'an improved shrinking die vwhich is 'quicklyadjustable to accomplish optimum ranges -of shrinking. 1 "Another objeet isthe provision of ashrin-king -die which during torming operations will not leave an irregular surface on the =metal being worked, but, at the most-will only'resultim a loss of polish. l

A further object is to provide uanrlimpreve'd shrinking die, which during forming .operations will not produce wrinkles tor folds: in the cm'etal worked.

A still further object is to provideasshrinking die which is easy to install, effective in operation andcs'turdy i-n construction. I

Eurther objects and-advantages 10f the i-nvention will (be seenfrom the fol'lowvingdescription,

particularly when taken in conjunction witli -the accompanying drawings which forma part thereof.

Iii-the drawings: Y Figure 1 ii is a side elevational view, -=part'ly'- in section, of the present device. l

Figure 2 is a top View of the bottom portion of Figure 31s a transverse sectionalview'taken alongthe-line3 '3 of Figure 1.

For convenience of description, the present device maybe considered ascomposed of two major component partsSandTB; part Fhereinafter gheing' referred to as the peening and- 'die" member, wedgedly affixed to the reciprocating ram 'fT-o'f a Yeder hammer, "for example;"and1part 6,

hereinafter being referred toas an anvil member,

hammer." It istobe understood, ofcourseythat thepositioning of these members!) andlionthe 1 reciprocating and stationary -menibers""of the Yoderhammer can'be reversed;

' Thejp'eening'and'die'member' 5 is wedged" into position on the reciprocating ram '11 of a"Yo'der hammer, for example, 'by means of its dovetail portion Qan'dhas a concave, recess H fform'edgin the'peeni'n'g surface thereof which is adaptedto receivethe convex'portion |'2' ofan adjustable forminghead IShingedly affixed in .a'nvil memberi6, later to be described.

Anvil member 6 is wedged into. rig-idposition-on the tool post 8 of. a "Yoder hammer, forexample, by means ofv its dovetail vportion ll-Land ..isi-p1 o vided with an adjustable forming head [3 .positioned ina chamber IJO .ofdthelanvilsmem-ber- -fi. Forming head'l3 has a convex headLLWhichflis so formed as to mate with the concaverecess! I formed in the peening surface ni -the mooning,

and die member'5Q Further, forming head [3 is provided with an arm I5, integrally connected to the convex head l2, which is hingedly mounted Forming head I3 is furto and positioned below the handle 2| prefer:

Handle 2| is adjust-v ably locked in selected position by a locking means comprising a spring 30 adapted to actuate lever 23 pivoted to handle 21 by pin 24, and a locking pin 25 carried by lever 23 which is adapted -to be selectively positioned into index recesses 26 when aligned therewith. Cam member 20,

rigidly affixed to cam shaft l9 by means of pin 21 (see Fig. 2), is adapted to work along cam surface 28 to displace'forming head I3 com mensurate with the predetermined movement of the handle 2i.

Thus it will be seen that forming head I3 is adjustably carried by anvil member 6 so that the convex head l2 may lie flush with the peening surface of member 6 or may be protruded thereabove for cooperation with the recess formed in member 5.

The operation of the present device is as follows:

During forming operations, when it is desired to shrink a sheet of metal at any location other than on the edges, i. e., for instance, amiddle,

portion thereof, that portion of the sheet which is to be shrunk is positioned between the anvil member 6 and the peening and die member forming head I3 is raised to the desired position by manipulating handle 2! and its associated locking elements; the Yoder hammer is put into operation so that the metal is forced to flow up and into the concave recess ll formed in the peening surface of peening and die member 5; the Yoder hammer is then stopped and forming head 13 is allowed to recede into its chamber H1 in anvil member 6 by releasing the locking means and actuating handle 2I; the

Yoder hammer is then started again and the sheet is pulled from between the anvil member 6 and the peening and die member 5, duringwhich time the hump formed in the sheet by the operation next preceeding is shrunk down to form a continuation of the surface of the surrounding portions of the sheet by means of the peening surface of the peening member impinging thereportions of the sheet'by means of the peening surface of the peening memberimpinging theree I have described herein some uses of my invention, I wish it to be understood that I do not intend to limit myself thereby, except within the scope of the appended claims.

Iherefore, it will be seen that I have provided an attachment for a sheet metal working and forming machine which accomplishes a function heretofore impossible to perform by existing metal working tools, 1. e., the dual function or shrinking metal on the edges as well as in the middle or central portions thereof, by means of a single unit without the necessity of substitutin several different attachments for the performing of th 'two operations. p

said peen member having a concave recess formed therein surrounded by a flat peening surface, and

said anvil .member having a projecting forming head movably mounted therein, surrounded by a flat surface adapted to cooperate-with the peening surface of said peen member, and means for extending said forming head from a retracted position within said anvil to a position extending beyond the surface of said anvil. I

2. A device for flowing sheet aterial adapted to be attached to a reciprocating power hammer, including 'a peen member and an anvil member, said peen member having a concave recess formed therein surrounded by a fiat peening surface, and said anvil member having a projecting forming head movably mounted therein surrounded by a fiat surface, adapted to cooperate with the peening surface of the said peen member,.means for extending the projection of the forming surface beyond the peening surface and means for locking movably mounted therein, said forming head in upon. Continuation of this operation on various portions of the sheet Will result in the shrinking required in the desired forming of the sheet.

0n the other hand, if it is desired to shrink the edges of a metal sheet during forming operations, the edges of the sheet are positioned be tween the anvil member 6 and the peening and die member 5; formin head I3 is raised to the desired position by manipulating handle 2| and its associated locking elements; the Yoder hammer is put into operation so that metal is forced to flow up and into the concave recess I l formed in the peening surface of the peening and die member 5 and at the same time the sheet is drawn out from between the anvil and peening and die member, during which time the hump formed in the sheet is shrunk down to form a continuation of the surface of the surrounding said anvil aligned with the'concave recess in said peen for cooperation therewith in forming sheet metal, and a forming head moving mechanism for fully retracting, and regulating the projection of said forming head relative to said anvil.

4. An attachment for a reciprocating power hammer for a sheet metal working and forming machine, including a peen member and an anvil member, said peen member having'a concave recess formed in the peening end thereof surrounded by a fiat peening surface, said anvil member having aconvex-shaped forming head movably mounted therein, said forming head in said anvil aligned with the concave recess in said peen for cooperation therewith in forming sheet metal, cam means to regulate the extentof said forming head above the surface of said anvil, and means to lock said formin head in selected positions relative to said anvil surface.

j FRANK czAPI Wsm. 

